// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_
#define MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_

#include <stddef.h>
#include <stdint.h>

#include <vector>

#include "base/macros.h"
#include "media/midi/usb_midi_export.h"
#include "media/midi/usb_midi_jack.h"

namespace midi {

// UsbMidiOutputStream converts MIDI data to USB-MIDI data.
// See "USB Device Class Definition for MIDI Devices" Release 1.0,
// Section 4 "USB-MIDI Event Packets" for details.
class USB_MIDI_EXPORT UsbMidiOutputStream {
public:
    explicit UsbMidiOutputStream(const UsbMidiJack& jack);

    // Converts |data| to USB-MIDI data and send it to the jack.
    void Send(const std::vector<uint8_t>& data);

    const UsbMidiJack& jack() const { return jack_; }

private:
    size_t GetSize(const std::vector<uint8_t>& data) const;
    uint8_t Get(const std::vector<uint8_t>& data, size_t index) const;

    bool PushSysExMessage(const std::vector<uint8_t>& data,
        size_t* current,
        std::vector<uint8_t>* data_to_send);
    bool PushSysCommonMessage(const std::vector<uint8_t>& data,
        size_t* current,
        std::vector<uint8_t>* data_to_send);
    void PushSysRTMessage(const std::vector<uint8_t>& data,
        size_t* current,
        std::vector<uint8_t>* data_to_send);
    bool PushChannelMessage(const std::vector<uint8_t>& data,
        size_t* current,
        std::vector<uint8_t>* data_to_send);

    static const size_t kPacketContentSize = 3;

    UsbMidiJack jack_;
    size_t pending_size_;
    uint8_t pending_data_[kPacketContentSize];
    bool is_sending_sysex_;

    DISALLOW_COPY_AND_ASSIGN(UsbMidiOutputStream);
};

} // namespace midi

#endif // MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_
